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What is a quasi resonant switching power supply?

Article Source：Kinri Energy | Author：Kinri Energy | Issuing Time：2024.05.08
Quasi resonant switching power supply is a topology structure of switching power supply that combines the characteristics of resonance and switching power supply to achieve high efficiency and low loss energy conversion. During operation, quasi resonant switching power supplies use resonant circuits to reduce the losses of switching tubes and improve overall efficiency. Its working principle is similar to traditional switching power supplies, but to a certain extent, it adopts resonance technology.


Quasi resonant switching power supply

The main characteristics of quasi resonant switching power supply include:

Resonance characteristics: Compared with traditional switching power supplies, quasi resonant switching power supplies use resonant circuits to achieve the switching tube to turn off at zero or low voltage, thereby reducing switching losses and EMI (electromagnetic interference).

High efficiency: By reducing the loss of switching tubes, quasi resonant switching power supplies can achieve high conversion efficiency, save energy, and reduce heat dissipation requirements.

Low electromagnetic interference: The use of resonant circuits can reduce the electromagnetic interference generated by switching power supplies, help improve the system's anti-interference ability, and reduce interference with other electronic devices.

Lower cost: Compared to fully resonant switching power supplies, quasi resonant switching power supplies typically have a simpler circuit structure and lower cost, while maintaining higher efficiency and performance.

Quasi resonant switching power supplies are widely used in various electronic devices, such as power adapters, televisions, computer displays, industrial power supplies, etc., to meet the requirements of high efficiency, low cost, and low electromagnetic interference.
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